Goodwill and other intangible assets (Tables)

12 Months Ended

Dec. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

A summary of total amortizing intangible assets follows.

	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	(In thousands)
December 31, 2022
Core deposit	$	218,000	$	40,875	$	177,125
Other		43,000		10,751		32,249
Total	$	261,000	$	51,626	$	209,374
December 31, 2021
Core deposit	$	131,664	$	127,746	$	3,918
Other		6,757		6,677		80
Total	$	138,421	$	134,423	$	3,998

Summary of Estimated Amortization Expense

Estimated amortization expense in future years for such intangible assets is as follows:

	(In thousands)
Year ending December 31:
2023	$	62,044
2024		52,992
2025		37,939
2026		26,887
2027		17,835
Later years		11,677
	$	209,374

Summary of Goodwill Assigned to Reportable Segments for Purposes of Testing for Impairment

A summary of goodwill assigned to each of the Company’s reportable segments as of December 31, 2022 and 2021 for purposes of testing for impairment is as follows:

	December 31, 2021		2022 Transactions (a)		December 31, 2022
	(In thousands)
Business Banking	$	864,366	$	693,905	$	1,558,271
Commercial Banking		1,401,873		2,686,253		4,088,126
Commercial Real Estate		654,389		291,217		945,606
Discretionary Portfolio		—		—		—
Residential Mortgage Banking		—		—		—
Retail Banking		1,309,191		221,196		1,530,387
All Other		363,293		4,406		367,699
Total	$	4,593,112	$	3,896,977	$	8,490,089

(a)All increases relate to the acquisition of People's United on April 1, 2022. The increase in "All Other" was partially offset by an $11 million decrease representing goodwill allocated to the M&T Insurance Agency sold in October 2022. Further information regarding those transactions is provided in note 2.